Hoist



July 11, 1944. F. LOCK l 2,353,479

HOIST Filed Sept. 6, 1941 v2 Sheets-She a; 1

ATTORNEY July 11, 1944. F. L'OCK 2,353,479

HOIST Filed Sept. 6, 1941 2 Sheets-Sheet 2 INVENTOR ATTORNEY PatentedJuly 11, 1944 UNITED STATES PATENT OFFICE HOIST Application September 6,1941, Serial No. 409,770

1 Claim.

This invention relates to a hoist, and more particularly to a hoist ofthe type in which the load is elevated and lowered by a cable or wirerope that is wound and unwound by rotation of a drum.

Those skilled in the art fully appreciate that the capacity of a hoistof the class described may be changed by the simple manipulation of thecable or wire rope. Thus, when the load is directly suspended, asthrough a load block, by a single strand of wire rope, the hoist isadapted for a particular load weight. By removing the load block fromthe wire rope, and passing the wire rope about a load sheave, whilesecuring the end of the rope to a fixed portion of the hoist, thecapacity of the hoist is doubled. Thus, the load is now held suspendedby two strands of rope, and is elevated at one half the speed with whichthe load is elevated when carried by a load block secured at the end ofa single strand of rope.

My invention relates to novel means for readily securing the Wire ropeto the load block, or to a fixed portion of the hoist, so that the hoistcapacity may be changed quite rapidly and with great facility. Themanufacturing and operating economies effected are quite obvious.

A further feature of my invention relates to the load block constructionI have devised, whereby a quick connection may be made between the wirerope and the load block, and whereby the load hook may simultaneously beassembled to the load block.

I have outlined my invention in order that the operation andconstruction thereof to be hereinafter presented, may be more clearlyunderstood. Naturally, the conception on which my invention is based,may be embodied in forms other than that which I shall hereinafter showand describe, so that my patent claim should not be unduly limited inscope.

Referring now to the drawings, Fig. 1 is a vertical view of a hoistillustrating the wire rope assembled to a load block, and as analternative, passed about a load sheave and secured to a fixed portionof the hoist. Fig. 2 is a View taken of Fig. 1 looking in the directionof line 2-2. Fig. 3 is an exploded View showing the parts for securingthe end of the wire rope or cable to the hoist. Fig. 4 is a crosssection of the load block showing its construction. Fig. 5 is a viewtaken at right angles to Fig. 4 with parts broken away. Fig. 6 is asectional view taken along lines 66 of Fig. 4.

Referring now more particularly to the drawings, and especially Fig. 1,there is illustrated there a hoist of the type in which a drum i0 isadapted to be rotated to wind and unwind a cable or wire rope ll,thereby lifting and lowering a load. This load may be supported by whatI term a load block 12 shown in dash and dot lines, which is secured tothe end of the cable II, and below the idler sheave i3 over which thecables passes in the particular structure. Those skilled in the art willappreciate; that in some hoists of this class, the rope will hangdownward directly from the drum I8, and- With the load blocksubstantially vertically disposed under the said drum.

When it is desired to double the load capacity of the hoist, the wirecable H is passed about a load sheave I i shown in full lines, the endof; the cable being first removed from the load block l2. Throughsuitably securing the end of the wire rope or cable II to what I term afastener l5 pivoted through the bolt It to the plate i! of the hoist, Iadapt the load for elevation at one half the speed at which it may belifted by the load block modification, while at the same time doublingthe load capacity.

I shall now describe in detail the construction of the fastener I 5 andthe means whereby the end of the wire rope II is secured thereto. Re-'ferring now to Figs. 2 and 3, the fastener I5 is shown in the form,preferably, of a casting having a cylindrical vertical bore IS in thecenter thereof. The vertical bore I3 communicates with the outside faceof the casting at one side through a vertica1 slot l9 extending theentire vertical length of the casting of the fastener'l5.. The verticalbore l8 communicates with the op posite face of the fastener l5 througha relatively short slot 251. The fastener is bored at 2| and 22 wherebyit may be readily mounted on the fixed plate portion 11 of the hoistthrough the pivot shaft IS.

The vertical bore l8 terminates in a shouldered portion 23 at the lowerend of the casting of the fastener l5, all for a purpose which shall bepresently indicated. The wires at the end of the wire rope or cable 1!are adapted to be frayed or untwisted into substantially taperedposition and then to be held in that tapered position by the addition ofa metal cast there about, to form the substantially solid tapered endportion 24. Any suitable metal may be used for the particular purpose,zinc being generally preferred. A sleeve member 25 is inserted over thewire rope or cable ll, and has an interior tapered bore 25 which istapered in complementary relation to the tapered end 24 of the rope. Inactual practice, molten zinc may be poured directly into the sleeve 25as the frayed or untwisted Wires of the cable are held within thesleeve. The tapered wire end 24 and the sleeve 25 are then integral.Those skilled in the art will now readily appreciate that if the sleeve25 and the tapered end 24 of the cable are placed with the lower surface2'! of the sleeve 25 against the shouldered portion 23 of the bore l8 ofthe fastener IS, the several parts will be retained in the position ofFig. 2 with the result that the wire rope will be held securely withinthe fastener Hi. The strength of the securing means will be considerablesince those skilled in the art will fully appreciate that in order torelease the rope by vertical pull thereon, it will be necessary toremove all of the metal which has been cast about the rope end to formthe tapered portion 24.

The slot |9 in the fastener I serves partially as a means of entrance'ofthe cable or wire rope H, and partially to permit pivotal movement ofthe fastener |5 relatively to the pivot shaft H5. The short slot servesthis last purpose. Those skilled in the art will now appreciate that torelease the end of the rope I from the fastener l5, and to remove ittherefrom, it is merely necessary tolift the tapered rope end portion 24into the position shown in the exploded view of Fig. 3, after which theparts are readily separated. The rope may then be secured to the loadblock I 2 to reduce the load capacity of the hoist while increasing thespeed of lifting and lowering of the load.

Referring now more particularly to Figs. 4, 5 and 6, I shall describethe means for securing the rope end to the'load block l2. The load blockI2 is formed of two identically similar forgings or castings and 3| heldtogether by bolts 32 and 33 as best illustrated in Fig. 6 and aswill bequite clear to those skilled in'the art. The heads of the bolts 32 and33 are adapted to rest in countersunk portions 34, whereby not todisturb the symmetry of the outside of the load block and thestreamlined appearance thereof. When the portions 30 and 3| of the loadblock are secured to one another as in Fig. 6, they act simultaneouslyto assemble relatively to the load block, the rope end 24 and the sleeve25', as best illustrated in Fig. 4. There it will be noted that the loadblock has an internal cylindrical opening 35 formed with a shoulderedportion 33 and terminating in a bore 3T. It will now be noted that inthe assembled position of the parts, the sleeve 25 fits against theshouldered portion 36 of the opening 35 whereby to hold the tapered end24 of the rope within the load block I2, and with the rope itselfpassing outwardly of the load block through the bore 31.

Simultaneously with the assembling of the rope end 24 relatively to theload block [2, a load hook 3B is also secured in assembled relation tothe load block. The load hook 38 is formed with a shaft portion 39 whichis threaded at 40 for cooperation with a retainer nut 4|. A ball bearingassembly, designated generally by reference numeral 42, is mounted in anopening 43 of a forging 44 in position to accept the downward thrust ofthe load hook 38 exerted through the nut 4| whereby to allow forrelatively free rotation of the load hook 38 relatively to the forging44.

The forging 44 is itself equipped with pins 45 mounted in bores 46 ofthe parts 30 and 3| of the load block, whereby to allow for freeswinging movement of the forging 44 relatively to the load block I2 asillustrated best in Fig. 5 in dash and dot lines. It will be now readilyobserved that not only is the load hook 38 rotatable relatively to theload block through its mounting in forging 44, but it is also capable ofpivotal swinging movement with the forging 44 about the pins 45, It willbe also readily observed that when the load block portions 3!? and 3|are assembled to form a load block, they are simultaneously adapted tosecure in assembled relation thereto the load hook forging 44 and thewire rope or cable I believe that the utility and novelty of myinvention will now be quite readily appreciated by those skilled in theart.

I now claim:

In a suspended hoist of the class described, a frame, a winding drummounted on said frame for winding and unwinding a wire load handlingrope, a wire load handling rope wound on said drum and having its enduntwisted and held in tapered. form by the addition of molten metal castabout the threads of said end, a sleeve comple menting the tapered formof said rope end, a pair of castings adapted to be bolted together toform a load block, said load block castings forming a cylindricalopening internal of said load block in communication with a relativelysmall bore leading to the outside of the assembled load block, saidsleeve and rope end being housed in said cylindrical opening with saidrope extending through said small bore, a housing member on said framewhereby to secure the end of said rope to the body of said hoist, saidhousing member having a slot for the sidewise entry of said wire ropetherein, and a shouldered internal bore communicating with said slotinto which said sleeve and rope end may be moved downwardly against theshoulder of said internal bore to be retained therein.

FRANK LOCK.

